Steam-generator.



B. MAKIN.

STEAM GENERATOR. APPLICATION FILED AUGJS, 101s.

1,104,81 1. Patented July 28, 1914.

2 SHEETSSHEET 1.

THE NORRIS FETERS CO. PHOTO-LITHOU WASHINGTON. D. C

. MAKIN.

STEAM GENERATOR.

APPLICATION FILED mums, 1913.

Patented July 28, 1914.

2 SHEETS-SHEET 2.

'I'Hb NORRIS PETERS (on PHOTO-LITHQ, WASHINGTON. D. C

EDWARD MAKIN, 0F MANCHESTER, ENGLAND.

STEAM-GENERATOR.

ncasii.

Specification of Letters Patent.

Patented July 28, 1914.

Application filed August 15, 1913. Serial No. 784,852.

To all whom it may concern Be it known that I, EDWARD MAKIN, a

subject of the King of Great Britain, re-

siding at l0 New Brown street, h lanchester, in the county of Lancaster,England, have invented new and useful Improvements in SteanrGenerators,of which the following is a specification.

My invention relates to improvements in steam generators of the type inwhich a primary generator is employed in the internally fired flue orother lines of the boiler. ln one such form of primary generator, forwhich I obtained Letters Patent in Great Britain No. 28689 of 1909, lemployed a pipe coiled into a D shape or section and placed between thedead plate and the bridge, the coil being supplied at its inlet end.with water under pressure by the direct action of a pump or equivalentmeans while at the delivery end the coil was connected to the waterspace of the boiler. In a subsequent arrangement I employed a pressureheader or reservoir containing feed water maintained at any requireddegree of pressure but always at a sufiicient pressure in excess of theboiler pressure, the feed water reservoir supplying any number of Dcoiled or similar primary generators fixed inthe flues of a battery ofboilers and being placed in the most convenient position relatively tothe said boilers. In this arrangement each D coil was supplied through apipe connected to one end, preferably the front end, of the coil and thecircuit of circulation of steam and water was completed by a connectionfrom the D coil to the water space of the boiler, the pressure header orreservoir being fitted with a pressure gage and the necessary valves andtaps being supplied to regulate the feed and the circulation. By thisarrangement one pump or equivalent was able to supply the feed water fora battery of boilers instead of having a separate pump for each boileras necessary under the previous practice.

My present invention is designed to obviate the continuous working ofthe pump or other supply of feed water under pressure, as for instancewhen fires are banked, or when little or no steam is required, as atmeal times, and for this purpose I employ a relief pipe connected at oneend to the feed pipe, which supplies feed water under pressure from thepressure header to the primary boiler, and at the other end I connectthis relief pipe to the boiler at a point above the internally firedflues. This relief pipe is connected to the pressure feed pipe at apoint between an ordinary back pressure valve, with which the latterisfitted and the 7 primary generator, and is controlled by a stop cockor valve. This stopcock or valve is only opened when the pressure feedis shut off, as for instance when the fires are banked or little or nosteam is required at the times above indicated and when this is done therelief pipe forms a reverse circuit the water then flowing from theboiler through say the back to the front of the D coil and thencethrough the relief pipe to the upper part of the boiler.

I illustrate an embodiment of my invention in the accompanying twosheets of drawings, in which Figure 1 is a front elevation, Fig. 2 afront sectional elevation and Fig. 3 a side elevation of a Lancashire ortwo fined boiler to which my improvements are applied. Fig. 4: is adetail view on a larger scale of the feed pipe from the pressure headerand the relief pipe from the boiler showing the arrangement of valves.

In these views, a designates the Lancashire or two flued boiler; 6 itstwo flues; c the pressure header or reservoir; cl the feed pump whichdraws water from the boiler 61 through the pipe 6 controlled by a stopcock f and supplies water under pressure to the header or reservoir 0through the pipe 9 which is provided with a back pressure valve h; 2'the pipe supplying water under pressure from the header 0 to the Dcoiled or similar primary generator Z placed in one of the flues b (orthere might be two such primary generators Z, one in each flue) j a stopvalve for controlling the supply pipe i; similar pipes z" i may beconnected from the pressure header to supply water to the like primarygenerators of other boilers, not shown; 72 a back pressure valve on thesupply pipe 27; Z the circulating pipe from the back of the primarygenerator Z to the boiler and m the stop valve for controlling the same;and p the pressure gage on the header or reservo1r 0. v

The relief pipe 01. which according to my present invention I connect tothe boiler a above the level of the top of the flues b is controlled bya stop valve 0, and at the other end is connected to the pipe 11 (whichsupplies water from the pressure trader a to the primary generator Z) ata point between the back pressure valve is and the primary generator.

By this combination and arrangement of parts I obtain a positivecirculation from the bottom of the boiler through the primary generatorand back to the boiler again, whereby great efliciency and economy isattained.

When the fires are banked or when little or no steam is required, thepump d or equivalent is stopped, and the pressure feed is shut off byclosing the stop cocks f and j, and the stop cock 0 is opened thusallowing water to flow from the boiler a through the pipe Z to the backof the D coiled or like primary generator Z, through the feed pipe 2',and relief pipe a back to the boiler. In its passage through the Dcoiled or like primary generator Z steam is generated and becomes highlyheated and issuing from the relief pipe at meets the saturated steam inthe boiler which acts upon the comparatively dry steam issuing from therelief pipe n, and by condensing it induces the flow of steam throughthe relief pipe n and D coil Z and so automatically promotes andmaintains a circulation in the reverse direction to that which the steamand water take when the boiler is normally at work.

I declare that what I claim and desire to secure by Letters Patent is vIn combination, a main generator having an internally fired flue, aprimary generator in said flue, a pressure header and pump, pipesconnecting said header and said pump to said generators, a back pressurevalve in the pipe between said header and said primary generator, arelief pipe having one end communicating with the pipe between saidprimary generator and said valve and having its other end communicatingwith said main generator at a point above said flue, and a valve in saidrelief pipe.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

S. W. GILLETT,

HERBERT ROWLAND ABBEY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

